can fast
Verbo regular: fast - fasted- fasted

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I can fast
you can fast
she can fast
we can fast
you can fast
they can fast 	I can be fasting
you can be fasting
she can be fasting
we can be fasting
you can be fasting
they can be fasting	I can have fasted
you can have fasted
she can have fasted
we can have fasted
you can have fasted
they can have fasted	I can have been fasting
you can have been fasting
she can have been fasting
we can have been fasting
you can have been fasting
they can have been fasting	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I cannot fast
you cannot fast
she cannot fast
we cannot fast
you cannot fast
they cannot fast 	I cannot be fasting
you cannot be fasting
she cannot be fasting
we cannot be fasting
you cannot be fasting
they cannot be fasting	I cannot have fasted
you cannot have fasted
she cannot have fasted
we cannot have fasted
you cannot have fasted
they cannot have fasted	I cannot have been fasting
you cannot have been fasting
she cannot have been fasting
we cannot have been fasting
you cannot have been fasting
they cannot have been fasting	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I fast?
can you fast?
can she fast?
can we fast?
can you fast?
can they fast? 	can I be fasting?
can you be fasting?
can she be fasting?
can we be fasting?
can you be fasting?
can they be fasting? 	can I have fasted?
can you have fasted?
can she have fasted?
can we have fasted?
can you have fasted?
can they have fasted? 	can I have been fasting?
can you have been fasting?
can she have been fasting?
can we have been fasting?
can you have been fasting?
can they have been fasting? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
can I not fast?
can you not fast?
can she not fast?
can we not fast?
can you not fast?
can they not fast? 	can I not be fasting?
can you not be fasting?
can she not be fasting?
can we not be fasting?
can you not be fasting?
can they not be fasting? 	can I not have fasted?
can you not have fasted?
can she not have fasted?
can we not have fasted?
can you not have fasted?
can they not have fasted? 	can I not have been fasting?
can you not have been fasting?
can she not have been fasting?
can we not have been fasting?
can you not have been fasting?
can they not have been fasting?